We review some opto-electronic devices based on the III-V/SOI heterogeneous integration platform, including lasers, modulators, wavelength converters, and photo-detectors. All of them are critical components for future on-chip interconnect and optical network-on-chip. The footprints of such devices are kept small by employing micro-cavity based structures. We give an overview of the device performances. The advantages over the all-silicon based devices are also discussed.